Tech Founder’s Year-End Playbook: Tax, R&D, Grants and Considerations

With the UK tax year ending on 5 April 2026, founders have a narrow window to lock in 2025/26 positions - especially around dividends (rates rise from 6 April 2026), payroll year-end filings, and looming digital filing changes.

Notification The information in this article is subject to change. Please always verify dates and figures on official sources, such as HMRC.

For 2026/27, the biggest “startup-shaped” shifts are: Making Tax Digital for Income Tax (MTD ITSA) for many sole traders, continued tightening of R&D tax relief compliance, changes to capital allowances (including a new 40% first-year allowance and reduced main-rate WDAs), and bigger EIS fundraising headroom (subject to legislation). [2]

What changes in 2026/27 and why it matters for founders

Founder pay and dividends

Budget 2025 set higher dividend tax rates from 6 April 2026: the ordinary dividend rate rises to 10.75% and the upper rate to 35.75% (additional rate remains 39.35%). [3] For owner-managed limited companies, that makes the timing of dividend declarations and payments, where legally supported by distributable reserves, more consequential than it has been for a while.

Corporation tax: stable rates but tougher penalties

The current small profits rate (19% under £50k) and main rate (25% over £250k) remain the operating framework on GOV.UK. [4] The bigger “behavioural” change for lean startups is enforcement: Budget 2025 announced increases to Corporation Tax late filing penalties for returns due on/after 1 April 2026 (e.g., £100 to £200 for being late, and higher escalations for repeated failures). [5]

R&D reliefs: one regime, more guardrails

If your accounting period begins on/after 1 April 2024, claims run through the merged scheme: a 20% taxable expenditure credit (merged RDEC), with Enhanced R&D Intensive Support (ERIS) for loss-making R&D-intensive SMEs (including a payable credit “worth up to 14.5% of surrenderable loss” and an intensity test of 30%). [6] Compliance is now a first-class risk: you may need to pre-notify HMRC within the “claim notification period” (ending 6 months after your period of account end) if you’re a first-time/returning claimant. [7] And you must submit the Additional Information Form before or on the same day as the CT600—sent first if the same day—or the R&D claim will be rejected. [8]

NICs and payroll cost planning

For 2026/27, employer Class 1 NICs are 15% above the secondary threshold, and employee NICs are 8% between the Primary Threshold and Upper Earnings Limit (then 2%). [9] The Employment Allowance remains a material lever for smaller employers, worth up to £10,500 for 2026/27 if eligible. [10]

VAT: threshold watch and admin discipline

The VAT registration threshold is £90,000 (with deregistration at £88,000), so high-growth SaaS/agency businesses should monitor rolling 12-month taxable turnover and the point at which being VAT-registered is commercially unavoidable. [11]

Capital allowances: timing is back on the agenda

AIA remains at £1 million. [12] But Budget 2025 introduced a new 40% first-year allowance for expenditure on/after 1 January 2026, and reduced the main rate writing-down allowance to 14% from 1 April 2026 (Corporation Tax) / 6 April 2026 (Income Tax), with hybrid rates for straddling periods. [13] Companies can also continue to claim full expensing (100%) on qualifying new plant and machinery bought from 1 April 2023. [14]

Last-minute actions before 5 April 2026 for 2025/26 year-end

The dates below matter because they are hard stops. The timeline is based on official guidance for payroll reporting, self assessment, and service closures. [15]

Key dates founders should diary: 2025/26 year-end into 2026/27

31-03-2026 : Download last 3 years returns (HMRC/CH joint filing service closes)

05-04-2026 : Tax year ends; last day to register for voluntary payrolling of benefits

06-04-2026 : 2026/27 starts (dividend rates rise; MTD ITSA starts for many sole traders)

19-04-2026 : Final RTI submission for 2025/26 due (FPS/EPS “final submission” indicator)

31-5-2026 : P60s due to employees

06-07-2026 : P11D/P11D(b) due

22-06-2026 : Class 1A NIC payment due (electronic)

The most immediate operational risk is digital workflow, not tax rates: from 1 April 2026, you’ll need commercial software to file annual accounts and Company Tax Returns with HMRC, and you should download and save at least the last 3 years’ filed returns by 31 March 2026 because you won’t be able to access them after the service closes. [16]

Funding and finance opportunities founders can act on locally

Programme	Best for	Deadline or cadence	Typical award size	Link
Innovate UK “AI Champions: Frontier AI Phase 1”	SMEs validating frontier AI/ML feasibility	Closes 29 Apr 2026 (11:00)	Project costs £150k–£250k; grant rate depends on size/category (competition rules)	Click here
Knowledge Transfer Partnership (KTP) Round 1 2026/27	Embedding university/Catapult capability into a business	Closes 1 Apr 2026 (11:00)	Projects 12–36 months; eligible costs typically ~£8,500/month (co-funded)	Click here
Worcestershire County Council grants (Enterprising / Elevate / Innovation + BEAS energy)	Local SMEs needing matched capital/innovation support	Funding currently closed; next round expected spring 2026	Start-up/growth grants £1k–£10k; innovation grants £2.5k–£30k; energy efficiency up to £100k	Click here
SEIS and EIS	Angel/seed rounds with investor tax relief	Rolling (but documentation takes time)	SEIS: company can raise up to £250k; EIS limits are set to increase from 6 Apr 2026 (pending)	Click here

A major 2026/27 opportunity is expected headroom for scale-ups raising EIS: from 6 April 2026, government policy is to increase EIS/VCT company investment limits and the gross assets test (for example, annual company investment limit to £10m and gross assets thresholds to £30m/£35m), but it is explicitly tied to Finance Bill 2025–26—so founders should treat it as pending until enacted. [18]

Compliance and admin tasks that reduce avoidable risk

Startups fail in spreadsheets as often as they fail in product. For 2026/27, the highest-ROI admin work is the work that prevents penalties, rejected claims, and broken fundraising timelines.

If you are a limited company:

(1) ensure your post-April 2026 filing stack is ready (commercial software, historic downloads), [16]

(2) treat R&D claims as an evidence project—track qualifying costs, keep technical narratives, and submit the Additional Information Form correctly, [19] and

(3) plan around Companies House reforms, including identity verification being phased in from 18 November 2025 and requiring directors/PSCs to verify during the transition period. [20]

If you are a sole trader (or a director with a separate sole-trade): check whether you are in scope for MTD ITSA from 6 April 2026 (generally if qualifying income is over £50,000, based on HMRC criteria), and choose compatible software early—HMRC has stated penalty points for late quarterly updates will not apply in the first MTD year (2026/27), but penalties still apply for late tax returns and late payment. [21]

Checklist for founders

By 31 Mar 2026: download/save last 3 years of CT/accounts submissions before the HMRC joint filing service closes. [16]

Before 5 Apr 2026: sanity-check director remuneration (salary/dividends) with your adviser; dividend rates rise from 6 Apr 2026. [3]

By 5 Apr 2026: decide whether to register to payroll benefits-in-kind for 2026/27 (if relevant). [22]

By 19 Apr 2026: submit final RTI FPS/EPS with the “final submission” indicator for 2025/26. [23]

By 31 May 2026: issue P60s to employees on payroll on 5 Apr 2026. [24]

By 6 Jul 2026: file P11D/P11D(b) if you provided expenses/benefits not payrolled; give employees copies. [25]

By 22 Jul 2026: pay Class 1A NIC (electronic payment deadline). [25]

For R&D: confirm whether you must pre-notify; ensure the Additional Information Form is submitted before/same day as CT600. [26]

For capex: review AIA/full expensing and the new 40% FYA / 14% WDA timing impacts on your spending plan. [27]

For sole traders >£50k qualifying income: prepare for MTD ITSA from 6 Apr 2026 (software, processes, quarterly updates). [28]

Sources and links

[1] Budget 2025 — Overview of tax legislation and rates (OOTLAR), incl. dividend tax rate changes from 6 Apr 2026 and CT penalty increases from 1 Apr 2026
https://www.gov.uk/government/publications/budget-2025-overview-of-tax-legislation-and-rates-ootlar/budget-2025-overview-of-tax-legislation-and-rates-ootlar

[2] Annex A: rates and allowances (tax year 2026 to 2027 tables, including dividend tax rates and NIC rates)
https://www.gov.uk/government/publications/budget-2025-overview-of-tax-legislation-and-rates-ootlar/annex-a-rates-and-allowances

[3] Corporation Tax rates and allowances (main rate / small profits rate / marginal relief limits)
https://www.gov.uk/government/publications/rates-and-allowances-corporation-tax/rates-and-allowances-corporation-tax

[4] R&D tax relief: merged scheme and ERIS (rates, intensity condition, PAYE cap context)
https://www.gov.uk/guidance/research-and-development-rd-tax-relief-the-merged-scheme-and-enhanced-rd-intensive-support

[5] R&D claim notification (pre-notification rules and notification period)
https://www.gov.uk/guidance/tell-hmrc-that-youre-planning-to-claim-research-and-development-rd-tax-relief

[6] R&D Additional Information Form (must be submitted before/on same day as CT600)
https://www.gov.uk/guidance/submit-detailed-information-before-you-claim-research-and-development-rd-tax-relief

[7] NIC rates and thresholds for employers 2026 to 2027 (thresholds, rates, Employment Allowance)
https://www.gov.uk/guidance/rates-and-thresholds-for-employers-2026-to-2027

[8] VAT thresholds (registration threshold and deregistration threshold)
https://www.gov.uk/vat-registration/thresholds

[9] Annual Investment Allowance (AIA) amount (£1 million)
https://www.gov.uk/capital-allowances/annual-investment-allowance

[10] Full expensing and 50% first-year allowance (companies; qualifying conditions)
https://www.gov.uk/capital-allowances/full-expensing

[11] Capital allowances policy note: new 40% FYA and WDA reduced to 14% (Finance Bill 2025–26 measure)
https://www.gov.uk/government/publications/new-first-year-allowance-and-main-rate-of-writing-down-allowances/capital-allowances-new-first-year-allowance-and-reducing-main-rate-writing-down-allowances

[12] Making Tax Digital for Income Tax (start date and threshold)
https://www.gov.uk/government/collections/making-tax-digital-for-income-tax

[13] Payroll year-end: P60 deadline
https://www.gov.uk/payroll-annual-reporting/give-employees-p60-form

[14] Expenses and benefits reporting deadlines (P11D/P11D(b) and Class 1A NIC deadlines)
https://www.gov.uk/employer-reporting-expenses-benefits/deadlines

[15] Employer Bulletin (Feb 2026): final submission indicator and 19 April deadline context
https://www.gov.uk/government/publications/employer-bulletin-february-2026/february-2026-issue-of-the-employer-bulletin

[16] HMRC/Companies House service closure: file accounts and Company Tax Return (software-only for HMRC from 1 Apr 2026; download history by 31 Mar 2026)
https://www.gov.uk/guidance/closure-of-the-service-to-file-your-company-accounts-and-tax-return

[17] Companies House identity verification rollout from 18 Nov 2025 (news release) + guidance
https://www.gov.uk/government/news/companies-house-confirms-identity-verification-rollout-from-18-november-2025
https://www.gov.uk/guidance/verify-your-identity-for-companies-house

[18] Innovate UK competition: AI Champions: Frontier AI Phase 1 (deadline, project size)
https://apply-for-innovation-funding.service.gov.uk/competition/2419/overview/bb8d7d28-0e63-4ee1-bf4a-790dfb3ae02f

[19] Innovate UK competition: Knowledge Transfer Partnership (KTP) Round 1 (deadline, typical monthly eligible costs)
https://apply-for-innovation-funding.service.gov.uk/competition/2380/overview/3e170dd3-4458-4c7e-a096-e0ea50b88040

[20] West Midlands SME Grant Programme details (range and intervention rate; availability varies)
https://www.businessgrowthwestmidlands.org.uk/support-programmes/west-midlands-business-grants-programme/

[21] Worcestershire County Council business grants (ranges, eligibility notes, and “expected spring 2026” next round note)
https://www.worcestershire.gov.uk/council-services/business/business-support-and-grants/business-grants

[22] EIS/VCT policy paper (operative date 6 Apr 2026; increased limits; pending legislation in Finance Bill 2025–26)
https://www.gov.uk/government/publications/enterprise-investment-scheme-eis-and-venture-capital-trusts-vct-changes/venture-capital-trusts-enterprise-investment-scheme-investment-limit-increase-and-restructure

[23] SEIS: company guidance (max £250k; gross assets/employee limits)
https://www.gov.uk/guidance/venture-capital-schemes-apply-to-use-the-seed-enterprise-investment-scheme

[24] Investor relief rates: EIS HS341 (30%) and SEIS HS393 (50%)
https://www.gov.uk/government/publications/enterprise-investment-scheme-income-tax-relief-hs341-self-assessment-helpsheet/hs341-enterprise-investment-scheme-income-tax-relief-2025
https://www.gov.uk/government/publications/seed-enterprise-investment-scheme-income-tax-and-capital-gains-tax-reliefs-hs393-self-assessment-helpsheet/hs393-seed-enterprise-investment-scheme-income-tax-and-capital-gains-tax-reliefs-2025